Discuss Tell us about your faults! in the Australia area at ElectriciansForums.net

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Saw this in a youtube documentary I was watching today, it also happens at a local school I used to work at.

EDIT: It's the plug on the wall!
 
Got sent on this job the other day, 'Contactor burnt out' Oh dear.

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IR and checked the windings of the motor all fine.

We replaced all the melted cabling, doing new whole runs of the the phases, also when we could on others and then cutting out the melted cable and crimping some of the longer control runs, replaced a few timers/relays, the contactor of course w/ overload. End to ended everything. IR on 100V. Done, we thought...

So then we powered the panel up in test and and the external suppy DP MCB for the the 110V Tx was tripping, I thought **** ive done something wrong, we then looked at the Tx, all the laminations were melted the varnish has all bubbled. So that was the fault.

Replaced the Tx and all worked :)
 
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Worked in a factory awhile back their switchboard had blown up, Turns out days earlier they had had an older switchboard upgraded and the electricians doing the work didn't bother cleaning out the copper and steel filings in the bottom of the board, after turning the thing on the filings moved around causing the filings to act as a conductor between two of the phases and blew the thing up! No one was hurt thankfully but we got the insurance job to mop up
 

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